Electric and Magnetism

You are holding a piece of metal which you think is a magnet. However, it is not attracted to any piece of metal around you. What is most likely the reason for this

• The magnet in your hand is turned off

• The magnet in your hand must be too old

• The metal in your hands not magnetic

• The magnet in your hand needs to be charged

A student connects a wooden spoon into a circuit. The bulb is not turning on because the wood is

• an insulator

• a conductor

• a source of electrical enegry

• less dense than the wire

Which of the following statements tells hot to create a static charge on a balloon?

• Stick the balloon to a wall

• Touch the balloon to a magnet

• Hold the balloon near water

• Rub the balloon with a wool cloth

If you wrap a nail with wire and then run a current through the wire, what does the nail and wire combination become?

• a motor

• A bar magnet

• an electromagnet

• a permanent magnet

Which of the following could be used for an insulator

• wood

• gold

• a penny

• wire

Which of the following describes electric charges?

• Like charges repel. Unlike charges attract.

• Like charges repel. Unlike charges repel

• Like charges attract. Unlike charges attract.

• Like charges attract. Unlike charges repel

Which of the following is an example of static electricity?

• A magnet attracting paperclips

• glue holding two pieces of paper together

• socks hat are stuck together after taken out of the dryer

• Ice sticking to a car's windshield in the winter

Which best describes an object that has a negative electric charge?

• It repels objects with a positive charge

• Its atoms have extra neutrons

• It would weight more if it has a positive charge

• It will attract objects with a positive charge

What is the purpose of a switch in an electric circuit?

• to change direction of the current

• to provide a "push" for the electrons

• to allow the circuit to be open or closed

• to increase the power of the current within the circuit

What would happen if you added more loops of wire within an electromagnet?

• the field would get stronger

• there would be no change

• the field would begin to move in the opposite direction

• the position of the poles would change